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Detecting nanoparticles in tissue using an optical iterative technique.

Inbar Yariv1, Gilad Rahamim1, Elad Shliselberg1

  • 1Faculty of Engineering and the Institute of Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan 5290002, Israel.

Biomedical Optics Express
|November 27, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel noninvasive optical technique to detect nanoparticles (NPs) in tissues. The method uses the Gerchberg-Saxton algorithm to estimate scattering, paving the way for determining NP penetration depth.

Keywords:
(120.5820) Scattering measurements(160.4236) Nanomaterials(190.4710) Optical nonlinearities in organic materials

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Area of Science:

  • Biomedical optics
  • Nanotechnology
  • Medical imaging

Background:

  • Determining nanoparticle (NP) penetration depth in tissues is crucial for biomedical applications but remains challenging.
  • Current methods for NP detection in tissues are often invasive or lack precision.

Purpose of the Study:

  • To present a new noninvasive optical method for detecting nanoparticles (NPs) within biological tissues.
  • To establish a technique for estimating tissue scattering properties related to NP presence.

Main Methods:

  • Utilized an optical iterative technique based on the Gerchberg-Saxton (G-S) algorithm.
  • Estimated the reduced scattering coefficient (µs') from the standard deviation (STD) of remitted light phase.
  • Validated the method through tissue simulations, tissue-like phantoms, and ex vivo experiments with Gold nanorods and nano Methylene Blue.

Main Results:

  • Demonstrated a linear relationship between STD of the retrieved phase and scattering components in simulations.
  • Observed a consistent linear ratio in tissue-like phantoms and ex vivo experiments.
  • Successfully detected the presence of NPs (Gold nanorods, nano Methylene Blue) in ex vivo tissues.

Conclusions:

  • The proposed optical iterative technique offers a noninvasive approach for NP detection in tissues.
  • The method provides a reliable estimation of scattering properties relevant to NP distribution.
  • This work represents a significant first step towards quantifying nanoparticle physical penetration depth in tissues.